* {
  box-sizing: border-box;
}

.bg {
  position: relative;
  height: 180vh;
  background-color: black;
}

.tip {
  text-align: center;
  color: #fff;
  padding-top: 20px;
}

.box {
  position: absolute;
  z-index: 99;
  top: 80%;
  left: 50%;
  width: 200px;
  height: 56px;
  margin-top: -28px;
  margin-left: -100px;
  display: flex;
  align-items: center;
  justify-content: center;
}

#btn {
  position: relative;
  width: 56px;
  height: 56px;
  border-radius: 28px;
  background-color: rgb(66 66 69);
}

#blue-circle {
  position: absolute;
  top: 80%;
  left: 50%;
  margin-top: -40px;
  margin-left: -40px;
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background-color: #0071e3;
}

#icon {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-20px, -20px);
}

.text {
  color: #fff;
  line-height: 56px;
  margin-left: 20px;
}